CVE-2021-21986: VMware Cloud Foundation

Critical severity, CVSS 9.8. EPSS: 13.3% chance of exploitation in the next 30 days.

The vSphere Client (HTML5) contains a vulnerability in a vSphere authentication mechanism for the Virtual SAN Health Check, Site Recovery, vSphere Lifecycle Manager, and VMware Cloud Director Availability plug-ins. A malicious actor with network access to port 443 on vCenter Server may perform actions allowed by the impacted plug-ins without authentication.

Affected products

• VMware Cloud Foundation: from 3.0, before 3.10.2.1 (fixed in 3.10.2.1); from 4.0, before 4.2.1 (fixed in 4.2.1)
• VMware vCenter Server: version 6.5 only; version 6.7 only; version 7.0 only

Published 2021-05-26. Last modified 2026-06-17.